Articles
CHROMOSOME NUMBERS OF THAI HERBS IN THE PLUMBAGO
Article number
675_27
Pages
187 – 189
Language
English
Abstract
In Thailand, there are only two known types of herbs in the Plumbago genus: Ceylon leadwort (P. zeylanica) and rose-coloured leadwort (P. indica). They are at risk of becoming extinct due to the difficulty in propagation.
This leads to a need for the study of their chromosome numbers for database storage.
In this study, the root tips and inflorescences were investigated by using the aceto-carmine smear method.
It was found that P. zeylanica and P. indica have different numbers of chromosomes, which are 2n = 22 and 2n = 14, respectively.
Because the size of metaphase chromosomes is extremely small, the study of the chromosome numbers needs to be done from the microsporocyte in the anther by collecting inflorescences between November and January.
For P. zeylanica, 11 bivalent chromosomes were found in the first meiotic metaphase. P. indica, 7 chromosomes were found in the second meiotic metaphase.
This leads to a need for the study of their chromosome numbers for database storage.
In this study, the root tips and inflorescences were investigated by using the aceto-carmine smear method.
It was found that P. zeylanica and P. indica have different numbers of chromosomes, which are 2n = 22 and 2n = 14, respectively.
Because the size of metaphase chromosomes is extremely small, the study of the chromosome numbers needs to be done from the microsporocyte in the anther by collecting inflorescences between November and January.
For P. zeylanica, 11 bivalent chromosomes were found in the first meiotic metaphase. P. indica, 7 chromosomes were found in the second meiotic metaphase.
Publication
Authors
C. Indananda
Keywords
Ceylon leadwort, mitotic and meiotic chromosomes, rose-coloured leadwort
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